<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="../bootstrap/css/bootstrap.css">
</head>
<body>
<button type="button" class="btn btn-danger">按钮</button>
<button type="button" class="btn btn-warning">按钮</button>
<button type="button" class="btn btn-success">按钮</button>
<button type="button" class="btn btn-info">按钮</button>
<button type="button" class="btn btn-outline-info">按钮</button>
<button type="button" class="btn btn-outline-danger">按钮</button>
<button type="button" class="btn btn-outline-dark">按钮</button>
<button type="button" class="btn btn-secondary">按钮</button>
<button type="button" class="btn btn-outline-secondary">按钮</button>
<button type="button" class="btn btn-primary">按钮</button>
<button type="button" class="btn btn-close"></button>
<button type="button" class="btn btn-check">按钮</button>
<button type="button" class="btn btn-link">Link</button>
<script src="../bootstrap/js/bootstrap.js"></script>
</body>
</html>